Submission #1130589

#	Time	Username	Problem	Language	Result	Execution time	Memory
1130589		lopkus	Star triangles (IZhO11_triangle)	C++20	100 / 100	296 ms	9020 KiB

triangle

#include <bits/stdc++.h>

#define int long long

using namespace std;

signed main() {
    ios_base::sync_with_stdio(false);
    cin.tie(NULL);
    int n;
    cin >> n;
    vector<int> x(n + 1);
    vector<int> y(n + 1);
    for(int i = 1; i <= n; i++) {
        cin >> x[i] >> y[i];
    }
    map<int,int> cntx;
    map<int,int> cnty;
    for(int i = 1; i <= n; i++) {
        cntx[x[i]] += 1;
        cnty[y[i]] += 1;
    }
    int ans = 0;
    for(int i = 1; i <= n; i++) {
        ans += (cntx[x[i]] - 1) * (cnty[y[i]] - 1);
    }
    cout << ans;
}

• Subtask 1: 100 / 100